- struct tukey_hinges *th = xzalloc (sizeof (*th));
- struct order_stats *os = (struct order_stats *) th;
- struct statistic *stat = (struct statistic *) th;
+ struct tukey_hinges *th = XZALLOC (struct tukey_hinges);
+ struct order_stats *os = &th->parent;
+ struct statistic *stat = &os->parent;